C450 AMG fuel pressure issues.
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C450 AMG fuel pressure issues.
Hi,
i have a 2016 mercedes c450 amg. The issue first started with engine cutting out in the high rpm -s, the next day it started cutting out every 10 seconds. The more gas i give the more fuel pressure drops. There were 2 fault codes, low and high pressure fuel systems did not have enough pressure. I replaced low pressure fuel pump twice, high pressure fuel pump and injectors rails. The only improvement was right after i replaced the low pressure fuel pumps, it worked for 1-2 km and started cutting out. I and my mechanics out of ideas on what could be the issue
i have a 2016 mercedes c450 amg. The issue first started with engine cutting out in the high rpm -s, the next day it started cutting out every 10 seconds. The more gas i give the more fuel pressure drops. There were 2 fault codes, low and high pressure fuel systems did not have enough pressure. I replaced low pressure fuel pump twice, high pressure fuel pump and injectors rails. The only improvement was right after i replaced the low pressure fuel pumps, it worked for 1-2 km and started cutting out. I and my mechanics out of ideas on what could be the issue
Out Of Control!!
Joined: Apr 2019
Posts: 12,007
Likes: 6,831
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Hi,
i have a 2016 mercedes c450 amg. The issue first started with engine cutting out in the high rpm -s, the next day it started cutting out every 10 seconds. The more gas i give the more fuel pressure drops. There were 2 fault codes, low and high pressure fuel systems did not have enough pressure. I replaced low pressure fuel pump twice, high pressure fuel pump and injectors rails. The only improvement was right after i replaced the low pressure fuel pumps, it worked for 1-2 km and started cutting out. I and my mechanics out of ideas on what could be the issue
i have a 2016 mercedes c450 amg. The issue first started with engine cutting out in the high rpm -s, the next day it started cutting out every 10 seconds. The more gas i give the more fuel pressure drops. There were 2 fault codes, low and high pressure fuel systems did not have enough pressure. I replaced low pressure fuel pump twice, high pressure fuel pump and injectors rails. The only improvement was right after i replaced the low pressure fuel pumps, it worked for 1-2 km and started cutting out. I and my mechanics out of ideas on what could be the issue
Having replaced all the suspects the short list is extra short... fuel filter!
- What's your current mileage ?
- what is tank low pressure ?
- what is rail high side pressure ?
- what is the comprehensive fault report (not only ECU) ?
Last edited by CaliBenzDriver; Apr 4, 2026 at 09:54 PM.
Out Of Control!!
Joined: Apr 2019
Posts: 12,007
Likes: 6,831
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Around what mileage?
How was this diagnosed?
Last edited by CaliBenzDriver; Apr 4, 2026 at 09:54 PM.
